Abstract

Humidity sensing properties of luminescent metal-organic framework/organic polymer (MOF-polymer) mixed-matrix membranes (MMMs) 3∞[Ba0.98Eu0.02Im2]@PSF (Im = imidazolate, PSF = polysulfone Ultrason® S) and 3∞[Sr0.9Eu0.1Im2]@PSF, as well as 3∞[Ce(Im)3ImH]·ImH@PSF were investigated. The MMMs thereby show superior properties compared to the bulk MOFs especially in stability, handling and log-term monitoring. In order to evaluate the films for such real status analyses, both sensitivity and stability were determined and compared to the bulk MOFs. Therefore, the progress of the humidity induced luminescence intensity quenching of the MMMs and the corresponding bulk substances was investigated for several pre-set relative humidities at room temperature. The MMMs show a distinct and diverse luminescence loss and sensitivity rendering a monitoring of very low relative humidity of only 2% accessible.

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